Cleanable anti-altering printing ink

Abstract

The invention discloses a safety ink that can be scrubbed away. The main ingredients include pigment, link stuff and an additive; the composition formula is as follows: (1) the organic pigment is adopted in pigment; (2) natural resin, phenolic resin or alkyd resin modified by colophony is added to the formula as the link stuff; and (3) mineral oil, wetting dispersant and wax are added in the formula as the additive; and the specific formula is as follows: the content of the pigment is 20-30 percent; the content of the link stuff is 60-70 percent; and the content of the additive is 2-10 percent. The invention has the advantages that when volatile or short-acting organic solvent is used for altering notes, the contents printed with the safety ink of the invention can present the marks of loss, spread or washing away, and therefore, the ink can effectively prevent a fake producer from obliterating and altering a genuine note. The ink has reasonable ingredient design and low manufacture cost and can be used for wet offset printing and the like.

Description

technical field [0001] The invention belongs to the field of printing inks, in particular to an anti-alteration ink which can be scrubbed. Background technique [0002] In recent years, bill crime has become a serious economic crime. Bank drafts, corporate crimes, and invoices in financial bills have become the key targets of criminals, involving huge amounts of money and serious losses. Invoices, checks and various securities are often forged, altered and altered by criminals, which has become a major public hazard in today's society. Looking at the counterfeit bills sold in the market, they have the following characteristics: the means of counterfeiting are becoming more and more hidden. Due to the high production technology and anti-counterfeiting means of real bills, counterfeiters forge less and less, and often use real bills to alter and alter method. In order to keep the face of the bill flat and to carry out effective alteration, counterfeiters often use volatile ...

AI Technical Summary

Problems solved by technology

In addition, bills printed with this kind of scrubable anti-alteration ink are prone to discoloration and instability when exposed to oxygen in the air in the high-temperature and high-humidity environment in the south, and the shelf life is too short, so they are gradually being eliminated.

[0004] The other is the scrubable ink that can change from color to colorless, such as the red anti-alteration ink used on bank drafts and checks. This type of scrubable anti-alteration ink cannot be used for wet offset printing, and can only be used for letterpress printing. The particles are very coarse, and fine printing cannot be achieved, and the printed content is usually only lines, and the shelf life of the bill is too short

At the same time, the application field is narrow, and it cannot be applied to carbonless paper, thermal paper and some special paper receipts.

For example, on carbonless paper bills, printing with such erasable anti-alteration inks usually affects the color development of carbonless paper, so it cannot be applied

[0005] In addition, there is currently a type of tribochromatic infrared invisible anti-counterfeiting ink. The characteristics of this type of anti-counterfeiting ink are: the ink itself is colorless, invisible to the naked eye, and does not have the function of fine printing

The printing ink changes color when it meets metal friction, it can only be used to identify the authenticity of the bill, and it cannot solve the problem of altering and altering counterfeit bills with real bills, that is, it cannot effectively prevent counterfeiters from altering and altering genuine bills